linux-kernel - Re: [RFC][2/3] Account and control virtual address space allocations

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Date:	Tue, 18 Mar 2008 10:11:16 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	linux-mm@...ck.org, Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][2/3] Account and control virtual address space
	allocations

On Tue, 2008-03-18 at 06:44 +0530, Balbir Singh wrote: 
> > If you're going to do this, I think you need a couple of phases.  
> > 
> > 1. update the vm_(un)acct_memory() functions to take an mm
> 
> There are other problems
> 
> 1. vm_(un)acct_memory is conditionally dependent on VM_ACCOUNT. Look at
> shmem_(un)acct_size for example

Yeah, but if VM_ACCOUNT isn't set, do you really want the controller
accounting for them?  It's there for a reason. :)

The shmem_acct_size() helpers look good.  I wonder if we should be using
that kind of things more generically.

> 2. These routines are not called from all contexts that we care about (look at
> insert_special_mapping())

Could you explain why "we" care about it and why it isn't accounted for
now?

-- Dave

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